Well, with 101 and considering your SC quota you strongly hold a chance of getting into the old reputed IIT.

So now regards with your rank, it is very difficult to predict as wihtout any official announcement anything to predict is quite out off bonds. But still to get a close look at your standing, You can use career360 JEE advanced rank predicter.

https://engineering.careers360.com/jee-advanced-rank-predictor

So I would recommend you to explore the technology and different engineering branches which IIT offers. This would ultimately help in opting the branch of your niche/interest.

Thank You